tableam: Add pg_dump support.

Andres Freund <andres@anarazel.de>

Commit: 3b925e905de3204ffef64fa4d53dd7bbac1a143f
Author: Andres Freund <andres@anarazel.de>
Date: 2019-03-06T17:54:38Z
Releases: 12.0
tableam: Add pg_dump support.

This adds pg_dump support for table AMs in a similar manner to how
tablespaces are handled. That is, instead of specifying the AM for
every CREATE TABLE etc, emit SET default_table_access_method
statements. That makes it easier to change the AM for all/most tables
in a dump, and allows restore to succeed even if some AM is not
available.

This increases the dump archive version, as a tables/matview's AM
needs to be tracked therein.

Author: Dimitri Dolgov, Andres Freund
Discussion:
    https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
    https://postgr.es/m/20190304234700.w5tmhducs5wxgzls@alap3.anarazel.de

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